/Engine/Source/Editor/UnrealEd/Public/DragAndDrop/BrushBuilderDragDropOp.h
Gets the widget that will serve as the decorator unless overridden. If you do not override, you will have no decorator
virtual [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< class [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > GetDefaultDecorator() const